Lateral-motion device for car-trucks.



No. 811,677. PATENTED PEB. 6, 1906. E. C. WASHBURN..

LATERAL MOTION DEVICE POR GAR TRUCKS.

APPLwATIoN FILED MAB. 2a. 19,05.

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. nIlIrIE l#` STATES VEDVV 1N C. WASHBURN, OF

PATENT OFFICE.

MINNEAPOLIS, MINNESOTA.

Specification of Letters Patent.

Patented Feb. 6, 1906.

Application filed March 25, 1905. Serial No. 251,946.

To @ZZ whom zit may concern:

Beit known that I, EDWIN C. WASHBURN, a citizen of the United States,residing at Minneapolis, in the county of Hennepin and State ofMinnesota, have invented certain new and useful Improvements inLateral-Motion Devices for Car-Trucks; and I do hereby declare thefollowing tobe a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.v

My present invention-relates to car-trucks, and has for its object toprovide an improved lateral-motion device therefor. i

To this end the invention consists of the novel devices and thecombination of devices hereinafter described, and defined in the claims.

The invention is illustrated in the accompanyin g drawings, wherein likecharacters indicate like parts thoughout the several views.

Figure 1 is a view, partly in front elevation and partly in verticalsection, showing a portion of the car and illustrating one of myimprovedlateral-motion devices interposed between ,the truck-bolster and thetruck-frame. Fig. 2 is a vertical section taken on the line r2 :c2 ofFig. 1, and Fig. 3 is a plan view showing in detail a so-called combinedspringcap and roller-base.

Referring to the drawings, the numeral 1 indicates a car-body bolster.The numeral 2 indicates a truclbolster, the numeral 3 one of the trussedside frames of the truck, and the numeral 4 a channel-like transom whichties together the lower parts of the two side frames. The said parts 1to 1, inclusive, are shown only in part, but they may be of any suitableconstruction.

The truck-bolster 2 will of course be pivotally connected by suitableking-bolt to the centralv portion of the car-bolster 1, and the twobolsters must be free for endwise movements together transversely of thecar-truck. As shown, a side bearing 5 is interposed between the bolsters1 and 2, but this forms no `part of my present invention.

Bolster-columns 7 are interposed between the upper and lower portion ofthe trussed side frame and are rigidly secured thereto in the usual orany suitable way, but preferably by column-bolts 8. The ends of thetransom are of course rigidly secured by bolts or rivets or othersuitable device both to the lower portions of the columns 7 and to thelower portions of the trussed side frames. Preferably light spring-bases9 are placed in the channel by ends of the transom 4 and are riveted orotherwise secured thereto in such position that they project bothforward and outward on the corresponding side frames of the truck.Coiled springs 10, as shown four in number, rest their lower ends on thespring-base 9. The latter preferably have upturned bosses, which hol'dthe same against lateral displacement. As shown, certain of thesesprings are reinforced by inner coils 10, but these inner coils form nopart of my present invention. A so-called combined spring-capandroller-base 11a rests upon the upper ends of each group of four springsand, as shown, is provided with a supplemental plate-section 11, againstwhich the said springs directly press. At its ends the combinedspring-cap and roller-base 11l is providedwith notches 12, that embracethe bolster-column 7 and hold said part 11d against movement in ahorizontal plane by permitting the same to freely move upward anddownward on saidv bolster-column. At these ends the truckbolster 2 isformed with flat bearing-surfaces 13 and with guard-'flanges 141 inrectangular arrangement that depend from said bearingsurfaces 13.Flattened rollers 15-that is, rollers that are elliptical incross-section-are interposed between the upper surfaces of the combinedspring caps and roller bases 11 and the overlying flat bearing-surfaces13 of the truck-bolster. These iiattened rollers 15 are preferablyarranged in pairs, one member of each part being located inward and theother outward of the vertical plane, intersecting longitudinally thecenter portion of the corresponding trussed side frame. These flattenedrollers 15 are formed with upwardly and downwardly projecting teeth 15,that engage, respectively, with seats 16 and 17, the former in thebolster 2 and the latter in the combined spring-cap and roller-base 11a.The seats 16 are covered or closed at their upper extremities', whilethe seats 17 open completely through the members 11*L and 11, so as topermit sand and dirt to be worked outward therefrom. The guard-flanges14 protect to a considerable extent the rollers 15 and coperatingbearing-surfaces against the accumulation of sand and dirt. The upperand lower teeth 15L are preferably arranged in laterally-spaced parts,as shown in Fig. 2, thereby disposing the same, so that they have IOS 'great efficiency and at the same time do not cover much of thebearing-surfaces of the roller.

With the parts put together as shown in Figs. 1 and 2 it is evident thatthe truckbolster 2 and parts carried thereby are free for limitedmovements transversely of the truck. It is also evident that in view ofthe flattened or elliptical form of the rollers they will cause thetruck-bolster to rise Whenever it is moved endWise. Hence gravity willact as a yielding force, tending to maintain the truckbolster in itsintermediate position, as shown in Fig. 1. The teeth of the ellipticalrollers cause the same to move over their cooperating bearing-surfaceswith a rolling ac tion as distinguished from a sliding action, and,furthermore, they maintain the said parts always in their properoperative relations. This flattened or elliptical form of the rollerbrings the bearing-surfaces of the truckbolsters as nearly as possibleto the corresponding bearing-surfaces of the combined spring-caps androller-bases.

The purposes of the lateral motion devices in the car-truck are too wellunderstood to require any special comment.

rIhe device described is very simple and of small cost and, furthermore,is sufficient for the purposes had in view.

What I claim, and desire to secure by Letters Patent of the UnitedStates, is as follows:

1. The combination with a car-truck and a car-bolster, said bolsterhaving fiat bearingsurfaces, of bearing members underlying the fiatsurfaces of said bolster, secured against lateral movements with respectto the truck side frames and provided with flat bearingof said bolster,combined springcaps and roller-bases resting on said springs andprovided with lat bearing-surfaces, and flattened rollers interposedbetween said flat bearingsurfaces and having toothed engagement withboth thereof, substantially as described.

3. In a car-truck, the combination with trussed side frames havingbolster-columns, of a spring-supported bearing-plate guided for verticalmovements by said bolster-columns and provided With seats 17, atruckbolster having the flat bearing-surfaces 13, formed with seats 16,and depending flanges 14, and elliptical rollers 15 interposed betweensaid bearing-plate 11 and the bearingsurfaces 13 of said bolster, andprovided with teeth 15a, engaging said seats 16 and 17, substantially asdescribed.

In testimony whereof I afliX my signature in presence of two witnesses.

EDWIN C. WASHBURN.

Witnesses:

H. I). KILGORE, MALIE HOEL.

